Corrections and clarifications

A bar chart about the price of prison phone calls contained several errors. The units were pounds, not pence, as stated; the cost of a 10-minute phone call from prison should have been shown as 1.09, not 1.9; the blue bars were on a different scale to the red bars and the red bars had no consistent scale (BT criticised for cost of jail phone calls, page 7, June 24, early editions).

In a report headed Study links low income families to low achieving children (page 12, June 7) we said that research by Jane Waldfogel and colleagues at Columbia University on income and school readiness found that the effect of being from a low-income home was more pronounced in the UK than the US. We should have made clear that this was only on the measure of children's behaviour, that the difference was small and that children were assessed at different ages in the UK and the US.

In early editions yesterday a front-page photograph of Rafael Nadal flexing his arm was headlined: Now this is what you call a bicep, Andy. Singular though it may sound, there is no such thing as a bicep. The word is biceps in both singular and plural.